Previous studies have revealed that the perceived quality of the parent–child relationship is essential for both physical health and psychological well-being. However, most studies have treated the perceived quality of this relationship as an independent variable. In this study, we considered it a dependent variable and examined the role of parents’ education and parent–child literacy activities on children’s perceived quality of the parent–child relationship. One hundred and eighty-six Chinese primary school students and their parents from low socioeconomic backgrounds participated in this study. Parents’ educational level and the parent–child literacy activity status were assessed based on parents’ reports, whereas parent–child relationships were assessed based on children’s reports. Results showed that parents’ educational level positively correlated with the frequency of parent–child literacy activities and children’s perceptions of the quality of the parent–child relationship. There was also a significant positive correlation between the frequency of parent–child literacy activities and children’s perceptions of the quality of the parent–child relationship. Further analyses showed that the frequency of parent–child literacy activities mediated the connection between parents’ educational level and children’s perceived quality of the parent–child relationship. These results suggest that boosting the frequency of parent–child literacy activities may be a useful strategy for facilitating the parent–child relationship.

Background: It's necessary to conduct meta-analysis to quantitatively evaluate the effect and safety of highintensity interval training (HIIT) on obese adolescents, to provide a basis for the management of obesity in adolescents.Methods: Randomized controlled trials (RCTs) on the role of HIIT in the obese adolescents were searched from PubMed databases and so on up to Jan 15, 2021. Two researchers independently performed literature screening, literature quality evaluation and data extraction according to the inclusion and exclusion criteria.Revman 5.3 Software and Stata 12.2 Software were used for data analysis.

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Background: Brain injury in premature infants (BIPI) seriously affects the growth and development of preterm infants. Magnetic resonance imaging (MRI) has become an important method of assessing brain development. The aim of this study was to explore the correlation between clinical features and total maturation score (TMS) by MRI in very low birth weight (VLBW) preterm infants with brain injury at term postmenstrual age (PMA).Methods: A retrospective cohort of 65 cases of BIPI with VLBW and 40 normal control cases were included, and all cases underwent MRI examination. The 2 groups were assessed in terms of TMS and sub-parameters (myelination, cortical infolding, germinal matrix, bands of migrating glial cells), and the correlation between TMS and term PMA was also analyzed. Results:The TMS of the BIPI group was lower than that of the control group (P<0.01). The differences in myelination and cortical infolding were statistically significant (P<0.01). No significant differences in the germinal matrix and bands of migrating glial cells were found. The linear regression equation showing a positive correlation between TMS and term PMA in normal preterm infants was y=1.164x-28.888 (t=9.478, P=0.000).Conclusions: TMS by conventional cranial MRI can objectively reflect the brain maturity and brain damage of premature infants, and is related to the term PMA.